Danfoss VLT AHF 005 Design Guide

14.10.5 Conversion Factor
Since a parameter value can only be transferred as a whole
number, a conversion factor must be used to transfer
decimals. See chapter 14.6 RS485: FC Protocol Parameter
Examples.
14.10.6 Parameter Values
Standard data types
Standard data types are int16, int32, uint8, uint16, and
uint32. They are stored as 4x registers (40001–4FFFF). The
parameters are read using function 03 hex read holding
registers. Parameters are written using the function 6 hex
preset single register for 1 register (16 bits), and the
function 10 hex preset multiple registers for 2 registers (32
bits). Readable sizes range from 1 register (16 bits) up to
10 registers (20 characters).
Non-standard data types
Non-standard data types are text strings and are stored as
4x registers (40001–4FFFF). The parameters are read using
function 03 hex Read holding registers and written using
function 10 hex Preset multiple registers. Readable sizes
range from 1 register (2 characters) up to 10 registers (20
characters).
14.11
RS485: FC Control Prole
14.11.1 Control Word According to FC
Prole
Speed ref.CTW
Master-follower
130BA274.11
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit
no.:
Illustration 14.16 CW Master-to-Slave
Bit Bit value=0 Bit value=1
00 Reference value External selection lsb
01 Reference value External selection msb
02 DC brake Ramp
03 Coasting No coasting
04 Quick stop Ramp
05 Hold output frequency Use ramp
06 Ramp stop Start
07 No function Reset
08 No function Jog
09 Ramp 1 Ramp 2
10 Data invalid Data valid
11 No function Relay 01 active
12 No function Relay 02 active
13 Parameter set-up Selection lsb
14 Parameter set-up Selection msb
15 No function Reverse
Explanation of the control bits
Bits 00/01
Bits 00 and 01 are used to select between the 4 reference
values, which are pre-programmed in parameter 3-10 Preset
Reference according to Table 14.20.
Programmed
reference value
Parameter Bit 01 Bit 00
1 [0]
parameter 3-10
Preset Reference
0 0
2 [1]
parameter 3-10
Preset Reference
0 1
3 [2]
parameter 3-10
Preset Reference
1 0
4 [3]
parameter 3-10
Preset Reference
1 1
Table 14.20 Control Bits
NOTICE
Make a selection in parameter 8-56 Preset Reference Select
to dene how bit 00/01 gates with the corresponding
function on the digital inputs.
Bit 02, DC brake
Bit 02=0 leads to DC braking and stop. Set braking current
and duration in parameter 2-01 DC Brake Current and
parameter 2-02 DC Braking Time.
Bit 02=1 leads to ramping.
Appendix Design Guide
MG16C302 Danfoss A/S © 11/2017 All rights reserved. 237
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Danfoss VLT AHF 005 Specifications

General

Brand	Danfoss
Model	VLT AHF 005
Category	DC Drives
Language	English